There's a little tagging spell we used to use on the Reservation to track dragons. Works on people.
With a name and address, civil litigation comes to mind.
And while I know it goes against your basic nature, hitting the floor screaming for help, and maybe a bruised cheek or bloody nose due to physical abuse, opens the door to file an assault complaint as well.
And while you may need work on your potions, I know a guy who knows a guy...
Fight smart. If anybody from the Ministry pays you a visit over your public diatribe, refer them to your solicitors (here). You have them on retainer now.